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n=6
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the answer is 6
As follows:- 4n+13 = n-8 4n-n = -8-13 3n = -21 n = -7
2n + 19 = -7 2n = -7 - 19 2n = -26 n= -13
n + 13 = 21. n = 21 - 13
The value of n is 3, by the commutative property.